Pendulum clock.



PATENTBD SEPT. 1, 1903.

1`TON/37,587. V y

" J- W. DAILY.

, PBNDULUM GLOGK.

APPLICATION FILED HOV. 22, 17902.

N0 MODEL.

Patented September 1, 1903.

PATENT OEEICE.

JOHN W. DAILY, OF BOSTON, MASSACHUSETTS.

PENDULUM CLOCK.

SFECIFICATION forming part of Letters Patent N0. 737,587, dated September 1, 1903.

Application led November 22, 1902. Serial No. 132,379. (No model.) Y

T0 (all wit/0m. t Huey con/cern:

Beit known that I, JOHN XV. DAILY, of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Clocks, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The present invention relates to a clock or chronometer and is mainly embodied in a compensating pendulum of novel construction and arrangement and in novel means for adjusting the eseapement-pallet with relation to the pendulum to bring about the proper relation between the two to obtain an even beat.

In accordance with the invention the pendulum is constructed mainly of some material which is not adapted to contract or expand in response to changes in temperature, the said pendulum having in its vertical dimensions two metallic portions, one being the thin spring part at the top and the other being the screw with scaled nut at the bottom. The pendulum is provided also with a metallic bob resting upon the said scaled nut, the latter turning upon the aforesaid metallic screw at the bottom of the pendulum. The bob is symmetrical in shape and twice as great in its vertical length as the combined length of the two metallic parts, so that when the metallic parts expand or contract owing to changes of temperature, such expansion and contraction having an intrinsic tendency to lower or raise the center of gravity of the bob, the latter by virtue of its own expansion or contraction raises or lowers its center of gravity so as to counteract exactly the contracting or expanding effects of the said metallic parts, so that the center of gravity is always the same distance from the axis of the pendulum.

The eseapement-pallet is connected with the pendulum by means of an arm which extends downward from said pallet toward the pendulum and is turned or bent so that it stands at a right angle to the pendulum, the said arm having a projecting portion which enters a slot in a member, which member is secured to the pendulum, but laterally adjustable with relation thereto. The said slot is herein shown as formed in a plate which has a sliding bearing in a frame-piece secured to the non-metallic body of the pendulum, the said frame also affording a support for a rotatable adjusting-screw which is threaded in a lug secured to the plate and prevented from longitudinal movement with relation to said frame. Thus by turning the said screw the slotted slide member is moved laterally with relation to the pendulum, thus rocking the eseapement-pallet with relation to the escape- Inent-wheel until it is exactly in the right position relative to the eseapement to afford an even beat as the pendulum swings.

A further feature of the invention consists in novel means for securing the pendulum proper to the upper portion of the pendulumrod, so that it is easier to disconnect the pendulum for shipping, dac.

Figure l is a front elevation of a portion of a clock-movement of the kind in which a short pendulum is used, said figure showing sufficient of the movement to illustrate the present invention. Fig. 2 is a similar view showing a portion of a clock movement in which a pendulum having one beat to the second is employed, and Fig. 3 a perspective view of a portion of the pendulum.

Referring to Fig. l, the bob a of the pendulum, which is of metal, is secured to the end of a pendulum-rod b h2, which is mainly of some material not susceptible to expansion or contraction through variations in temperaturesuch as wood, for example-the portion b2 being suspended by a iiexible metallic member b3 from a suitable pin or support c, projecting from the framework A of the clockmovement. The bob a is symmetrical in shape and is supported from its lower periphery by means of an adjusting-nut d, threaded upon a Inetal rod cl2, which is secured to the lower end of the pendulum member l), so that the bob can be raised or lowered by turning the member cl for regulating purposes.

In the construction above described the pendulum is self-compensating, for the reason that the longitudinal dimension of the symmetrically-shaped bob a is twice the length of the other metallic parts of the pen dulum-rodm namely, the supporting portions b3 and the rod d2, holding the bob of the pendulum-so that the vertical expansion of the bob will be twice as great as the Vertical expansion of the IOO members b3 b2, it being obvious, therefore, that as the supporting member (Zreeedes from the supporting-point c the center of gravity of the bob CL will be raised an equal distance, so that the said center of gravity will always be at the same distance from the supporting`- point.

In accordance with the invention the escapement-pallet c, which is shown as pivoted at e2 and arranged to cooperate with the eseapement-Wheel f, is connected with the pendulum by means of a bent rod e3 c4, the part e" of which stands substantially at a right angle to the pendulum-rod and is provided with an offset projection e5, which enters a slot g2 in a slide member g, which is supported in a frame g3, secured, as by screws g4, to the nonmetallic part of the pen dulum. The said frame g3 contains an adjusting-screw g5, which is capable of rotation in said frame, but is held longitudinally stationary with relation thereto by means of flanges or shoulders Q6 and Q7 at its opposite ends, the said adjusting-screw being threaded in the middle, as shown, and cooperating with a threaded opening in alug gS upon the sliding member g. By turning the adjusting-screw g5, therefore, the pallet e is rocked upon its pivot with relation to the eseapement-wheel f, so that the proper relation between the pendulum and the pallet and the escapement-wheel may be very delicately determined without trouble.

The construction shown in Fig. 2 is substantially thesame as that shown in Fig. l except that the construction is adapted to an eseapement-wheel F, provided with a secondshand F2 and arranged to be used with a pendulum of the proper length to permit one movement of the escapement-wheel at each second. The construction is substantially the same except that the pendulum in this case is supported at a point C above the escapementwheel, the upper portion B2 of the pendulumrod being provided with an opening B20 for the shaft of the seconds-hand in order to bring the parts into their proper relative position.

In order that the lower part of the pendulum may be readily 'removed from the clock when the clock is to be moved or shipped7 I have made the main portion of the pendulumrod in two parts Z9 b2, one of the said parts having a tongue b and the other a corresponding groove D, the tongue and the parts at the sides of the groove b5 being bored transversely to receive a locking-pin bf.

In order to prevent all tendency of the lower part of the pendulum to turn on the said pin, I provide one member with a plate bl, which is secured thereto, as by screws bs, the said plate thus affording the support for the member from which it is disconnected, it being obviously impossible for the said member to rock in either direction upon the pin to.

I claiml. In a clock, the combination with a pendulum; of an eseapement-pallet; a rod leading from said escapement-pallet to the pendulum; a slide member supported by the pendulum and connected with said rod; and means for adjusting said slide member laterally with relation to the pendulum, as set forth.

2. The herein-described pendulum having a rod made in two parts, one of the said parts being provided with a tongue, and the other provided with a corresponding` groove; a plate secured in one of said parts to afford a lateral support for the other and a transverse pin extending across the said groove through the said tongue, the tongue and groove portion being below the dial of the clock, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN W'. DAILY. lVitnesses NANCY I. FORD, y HENRY J. LIVERMORE. 

